(19)
(11) EP 0 368 536 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.04.1991 Bulletin 1991/14

(43) Date of publication A2:
16.05.1990 Bulletin 1990/20

(21) Application number: 89311236.7

(22) Date of filing: 31.10.1989
(51) International Patent Classification (IPC)5: C07F 7/21
(84) Designated Contracting States:
BE DE FR GB

(30) Priority: 09.11.1988 US 269522

(71) Applicant: DOW CORNING CORPORATION
Midland Michigan 48686-0994 (US)

(72) Inventors:
  • Baile, Gnaneshwar Rao
    Midland Michigan 48640 (US)
  • Herman, John Eric
    Midland Michigan 48640 (US)
  • Wyshak, Geoffrey Mark
    Midland Michigan 48640 (US)

(74) Representative: Laredo, Jack Joseph et al
Elkington and Fife Prospect House 8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB)


(56) References cited: : 
   
       


    (54) Preparation of cycloorganotrisilazanes


    (57) What is disclosed is a process for the rearrangement of cylcoorganopolysilazanes to cycloorgano­trisilazanes using quaternary ammonium halides as a catalyst. The quaternary ammonium halide has the formula Ri₄NX where at least one Ri is a group containing greater than 11 carbon atoms and X is a halogen atom. The rearrangement process is ran either as a batch or a continuous distillation procedure.





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